Prime p such that the prime before p is a substring of p^3.

Terms

a(0) =3a(1) =17a(2) =31a(3) =59a(4) =997a(5) =2837a(6) =57349a(7) =83773a(8) =224813a(9) =861743a(10) =9999991a(11) =61879669a(12) =95895673a(13) =763137931a(14) =1463016067a(15) =1608398527a(16) =6909512173a(17) =38095693807a(18) =94041857089